JPS635862B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a battery electrode plate having a structure in which a part of the upper part of a net-like or porous plate-like lattice body protrudes as an ear. An object of the present invention is to provide an electrode plate with improved mechanical strength and electrical performance by integrally filling the ears or the openings in the upper part of the grid body with a brazing material.

Batteries using electrode plates having a mesh or porous plate-like lattice include fuel cells, nickel-zinc batteries, lead chloride-magnesium batteries, silver oxide-zinc batteries, and the like. The electrode plates of these batteries usually have a structure in which an active material is adhered to a lattice body, and a portion of the upper part of the lattice body protrudes as an ear. However, in a battery that uses a plate with a part of the grid as the ear, when large current discharge, vibration resistance, and shock resistance are required, the electric resistance of the ear is large and the voltage loss is large. Furthermore, the mechanical strength of the ears is insufficient and the ears may break due to vibration or impact.

Conventionally, in order to eliminate the above-mentioned drawbacks, a method has been proposed in which separately prepared plate-shaped or linear ears are integrally provided on the upper part of the grid body by spot welding or pressure welding. However, this method has drawbacks such as an increase in the thickness of the portion where the ears are connected, which may cause an internal short circuit in the battery, and furthermore, workability is extremely poor.

The present invention eliminates the above-mentioned drawbacks,
A brazing material is applied to the ears of a pole plate having a structure in which a part of the upper part of a mesh or perforated plate protrudes as an ear, or the openings at the upper part of the grid including the ears, that is, the mesh portion or the porous portion. is filled to lower the electrical resistance of the part and increase its mechanical strength.

Hereinafter, the present invention will be specifically explained using the drawings.

Fig. 1 shows an electrode plate having a structure in which a part of the upper part of a conventional mesh-like lattice body protrudes as an ear part, Figs. 2 and 3 respectively show improved examples of the conventional structure, and Fig. 4 shows an example of the present invention. An embodiment according to the invention will be shown. Figure 1 to stage 4
In the figure, reference numeral 1 denotes a grid body, and for example, a copper net, expanded metal, or perforated plate is used for the negative electrode plate of a nickel-zinc battery. Reference numeral 2 denotes an ear portion, which serves to guide the electric power generated by the electrode plate to the outside. 3 is an active material attached to the grid body 1;
For example, the negative electrode plate of a nickel-zinc battery is made of zinc compounds.

In the conventional example shown in Fig. 1, a part of the upper part of the grid body 1 protrudes and becomes the ear part 2, and as mentioned earlier, the current is concentrated in the corresponding part, resulting in large voltage loss and mechanical damage. It has the disadvantage of being weak in strength. In the conventional example shown in FIG. 2, tabs 2 are integrally provided on the top of a net-like lattice body 1 by connecting a plate-like body by spot welding. Further, in the conventional example shown in FIG. 3, a linear body is connected to the grid body 1 by pressure contact or the like, and the ears 2 are integrally provided. However, as mentioned above, the methods shown in FIGS. 2 and 3 have the disadvantage that the thickness of the part where the ear part 2 is connected increases, which may cause an internal short circuit in the battery, and furthermore, it is difficult to work. There are drawbacks such as very poor performance.

The embodiment of the present invention shown in FIG. 4 has ears 2 formed by protruding a part of the upper part of a lattice body 1 made of a net, an expanded metal, a perforated plate, etc., and a brazing material 5 in the openings in the upper part of the lattice body 1. Fill the brazing filler metal 5 and the ear part 2.
etc. are integrated. In the figure, the dashed diagonal area is the area filled with the brazing filler metal 5. Various choices can be made as the brazing filler metal 5 depending on the material of the ears and the grid body 1, the type of active material 3, and the type of electrolyte used. For example, as a negative electrode plate of a nickel-zinc battery, It is preferable to use silver solder (for example, one consisting of 50% silver, 15% copper, 17% zinc, and 18% cadmium). In addition, brazing materials that can be used include brass brazing and phosphorous brazing. Various methods can be considered for filling the brazing material, but by instantaneously immersing the ears and the upper part of the grid before the active material is attached into the heated and melted brazing material and pulling them up, it is easy to fill the brazing material and fill the brazing material. The material, ears, etc. can be integrated. That is, the molten brazing material fills the openings, ie, the meshes, in the ears and the upper part of the grid body due to surface tension, while the other parts are only coated very thinly. By filling only the mesh without particularly increasing the thickness of the portion filled with the brazing material, it is possible to very easily lower the electrical resistance and increase the mechanical strength.

In the above embodiment, a part of the upper part of the lattice body is made to protrude as an ear part, and the ear part and the opening in the upper part of the lattice body are filled with brazing material. A method of filling only a portion of the filler metal with brazing material is still effective, although its effectiveness is reduced.

As described above, according to the present invention, by using a simple structure and means such as filling the ears or the openings in the upper part of the grid including the ears with a brazing material, the electrical resistance of the part can be lowered and the mechanical strength can be lowered. Therefore, it is possible to obtain a battery that can handle a large current and has excellent vibration resistance and impact resistance.

[Brief explanation of the drawing]

1 to 3 are partially cutaway front views showing examples of conventional battery plates of this type, and FIG. 4 is a partially cutaway front view showing an embodiment of the battery plate according to the present invention. It is. DESCRIPTION OF SYMBOLS 1... Lattice body, 2... Ear part, 3... Active material, 4... Brazing material.

Claims (1)

[Claims] 1. In a battery electrode plate having a structure in which a part of the upper part of a mesh-like or porous plate-like grid body 1 protrudes as an ear part 2, the ear part 2 or the ear part 2 and the grid body 1
A battery electrode plate characterized in that the upper opening is integrally filled with a brazing material.